When a House Boy is traveling with or at the Master’s instruction to any public event or private celebration (like July Fourth fireworks or a Detroit Tigers baseball game), the House Boy may be required to wear Minimal or Standard Clothing (Rule #111) consistent with the color, mascot, spirit or theme of the day’s activities.

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[2019 version not available online]

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Rule 050B-M — Themed Clothing 
Classified: Special Events and Celebrations